Improper Authentication Validation in Okta Access Gateway Pass-Through Authentication Source

published 2026-09-08 2 mo ago modified 2026-09-23 46 d ago also EUVD-2026-74171

cvss: 4.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

The Okta Access Gateway includes an optional pass-through authentication source that accepts user identity from a client-supplied HTTP header without cryptographic validation. In architectures where this optional source is enabled without an upstream reverse proxy or firewall configured to sanitize and enforce client headers, an unauthenticated user can supply an arbitrary identity value to initiate a session.

Patch / fix

fixed in 1

Okta Okta Access Gateway 2026.9.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 59 d ago (2026-09-10)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

Okta Okta Access Gateway

Classification

Weakness

CWE-287 Improper Authentication

References

trust.okta.com /security-advisories/improper-authentication-validation-in-okta-access-gateway-pass-through-authentication-sou
vendor-advisory

Sources

CVE List CVE-2026-78560
NVD CVE-2026-78560

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary